JP4960802B2 - Pressurized tube and manufacturing method thereof - Google Patents

Description

  The present invention relates to a pressurized tube for repairing a crack, a hole, or the like generated on an inner peripheral surface of an existing pipeline, and a manufacturing method thereof.

One method for repairing the inner peripheral surface of existing pipelines such as sewer pipelines and rainwater pipelines is to use a pressurized tube.
In the repair method using this pressure tube, a pressure tube capable of injecting air is inflated in the existing pipeline, and the outer peripheral surface of this pressure tube presses the inner peripheral surface of the existing pipeline. ing. In this case, the synthetic resin-made repair material attached to the outer peripheral surface of the pressure tube is pressure-bonded to the inner peripheral surface of the existing pipe line, and repairs such as cracks and holes in the inner peripheral surface of the existing pipe line can be performed.

  Such a repair method using a pressurized tube has the advantage that the pressurized tube can be easily transported because the compressed tube in a contracted state before injecting air can be carried in and out of the existing pipeline. ing. In addition, when the pressurized tube to which the fluid passage of the fixed pipe for securing the shape is secured is inflated in the existing pipeline, the inside of the tube becomes a cavity, so that the existing pipeline in the cavity of the pressurized tube Water can flow. For this reason, in the repair of the inner peripheral surface of the existing pipeline, there is no need to provide a bypass for flowing the water of the pipeline through water.

8 and 9 show a conventional pressure tube in the repair method.
Among these, the pressurizing tube 30 shown in FIG. 8 is inserted in order to secure a hollow portion inside the cylindrical body 31 having a single air chamber between the outer peripheral membrane and the inner peripheral membrane. The pipe 31p and the air inlet 32 for injecting air into the air chamber of the cylindrical body 31 are provided, and the cylindrical body 31 expands radially outward by injecting air from the air inlet 32. It has become.
A synthetic resin repair material 33 for repairing the inner peripheral surface of the existing pipe line is attached to the outer peripheral film of the cylindrical body 31. Moreover, although not shown in figure, between the outer peripheral film | membrane and inner peripheral film | membrane of the cylindrical body 31, many hanging threads for making the said space | interval constant are provided (refer patent document 1).

In addition, the pressurizing tube 40 shown in FIG. 9 has an X shape, a saddle shape, a work shape in the circumferential direction as shown in FIG. A suspension cloth 41a such as a Z-shape is provided. Compared to the pressure tube 30 in FIG. 8, there is no need for a pipe for securing a cavity inside the tube, and the tube always maintains flexibility, so that the bent portion can be used. It is easy to insert, and since it does not use a hard material such as a pipe, it has the advantage that it is folded small and does not take a storage place.
The pressurizing tube 40 includes a cylindrical body 41 in which a pleated air chamber 41d formed so as to be kept in a fixed shape by a hanging cloth 41a arranged in the circumferential direction between an outer peripheral membrane and an inner peripheral membrane is formed. The air injection port 42 for injecting air into the air chamber 41d and the outer film 43 wound around the outer peripheral film of the cylindrical body 41 are provided. By injecting air from the air injection port 42, the cylindrical body 41 has a diameter. It has a structure that expands outward.

  Between the outer peripheral film 41b and the inner peripheral film 41c of the cylindrical body 41, suspension cloth 41a is attached at equal intervals in the circumferential direction, and the suspension cloth 41a serves as a base wall and is an air chamber 41d arranged in the circumferential direction. Is formed. Moreover, although not shown in figure, the hanging cloth 41a is attached shorter than both end surfaces, and has the structure where air can distribute | circulate freely here. A synthetic resin repair material 44 for repairing the inner peripheral surface of the existing pipe line is mounted on the outer peripheral surface of the outer coating 43.

JP 2002-96389 A

In the conventional pressurized tube, when air is injected to expand the tubular body in the radially outward direction, a concave portion recessed in the radially inward direction is formed in the outer peripheral membrane of the tubular body in the attachment portion of the hanging thread or the hanging cloth. Depending on the size of the recess, the outer peripheral film of the cylindrical body cannot be uniformly pressed against the inner peripheral surface of the existing pipe line, so that the repair material cannot be uniformly crimped to the inner peripheral surface of the existing pipe line. was there.
For example, in the pressurizing tube 40 of FIG. 9, when the air chamber 41d is inflated by injecting air from the air inlet 42, the suspension cloth 41a pulls the outer peripheral film 41b and the inner peripheral film 41c of the cylindrical body 41. Therefore, in the attachment portion of the hanging cloth 41a, a recess that is recessed in the radially inward direction is formed in the outer peripheral film 41b of the cylindrical body 41.

In this case, the repair material 44 is wound around the outer peripheral film 41 b of the cylindrical body 41, but a gap is generated between the outer peripheral film 41 b of the cylindrical body 41 and the repair material 44 due to the depression by the concave portion. .
Since this gap opens at both ends in the axial direction, the occurrence of the gap causes variations in the surface pressure of the repair material 44. For this reason, depending on the size of the gap, it is difficult to evenly press the repair material to the inner peripheral surface of the existing pipe line.
In view of such problems, the present invention eliminates the concave portion of the outer peripheral film of the cylindrical body that is generated when air is injected to expand the cylindrical body in the radially outward direction, and the outer peripheral film of the cylindrical body is already provided. It is an object of the present invention to provide a pressure tube that can uniformly press the inner peripheral surface of a pipeline and can evenly press the repair material to the inner peripheral surface of an existing pipeline.

The present invention comprises a cylindrical body in which air chambers arranged in the circumferential direction are formed between the outer peripheral membrane and the inner peripheral membrane, and an air inlet for injecting air into the air chamber of the cylindrical body, In a pressurized tube that injects air into the air chamber from the air inlet and expands the cylindrical body in the radially inner and outer directions,
A plurality of second air chambers defined by the outer film and the outer peripheral film are formed by winding an outer film around the outer peripheral film of the cylindrical body and adhering each apex of the outer peripheral film and the end of the outer peripheral film. A communication hole for injecting air between each second air chamber and the corresponding air chamber is formed in the outer peripheral film.

According to the pressurizing tube of the present invention, a plurality of second air chambers defined by the outer film wound around the outer peripheral film of the cylindrical body and the outer peripheral film of the cylindrical body, and the corresponding air chambers Since the space is communicated, the internal pressures of the air chamber and the second air chamber can be made equal. For this reason, when the cylindrical body is expanded radially outward, the surface pressure can be made substantially constant over the entire surface of the outer coating.
As a result, the outer film wound around the outer peripheral film of the cylindrical body during expansion of the cylindrical body does not cause a recess, and the outer film can uniformly press the inner peripheral surface of the existing pipe line. The repair material attached to the outer coating can be uniformly crimped to the inner peripheral surface of the existing pipe line.

As described above, the pressurizing tube of the present invention has a structure in which a communication hole is formed in the outer peripheral membrane, but there are two types of methods for manufacturing the pressurizing tube of the present invention depending on the timing of forming this communication hole. A method is conceivable.
One of them is a method (hereinafter referred to as a first method) in which a communication hole is first drilled in the outer peripheral film and then an outer film is wound around the outer peripheral film to form a second air chamber (hereinafter referred to as the first method). On the contrary, a method of forming a second air chamber by first winding an outer film around the outer peripheral film and then drilling a communication hole in the outer peripheral film (hereinafter referred to as a second method).

As the method for producing the pressurized tube of the present invention, either the first method or the second method may be adopted. However, the first method has the following drawbacks.
That is, if the communication hole is previously drilled in the outer peripheral membrane, the air chamber cannot be expanded and the tubular body cannot be expanded radially outward. For this reason, in the first method, an outer film is wound around the outer peripheral film of the contracted cylindrical body, and both are bonded at predetermined intervals in the circumferential direction to form a second air chamber. When attaching an outer coating to the outer peripheral membrane of a cylindrical body, it is difficult to accurately position the outer coating in the circumferential direction with respect to the outer peripheral membrane, and pressurization of a distorted shape that does not become a perfect circle during expansion The probability of becoming a tube is high, and high precision is required in the manufacturing process.

Therefore, the present invention recommends that the following manufacturing method belonging to the second method is performed as a manufacturing method of the pressure tube in which the communication hole is formed in the outer film.
That is, the manufacturing method of the present invention is a manufacturing method of a pressurized tube including a cylindrical body in which air chambers arranged in the circumferential direction are formed between an outer peripheral membrane and an inner peripheral membrane, and includes the following steps ( 1) to (4) are included.

(1) A step of inflating the cylindrical body into a cylindrical shape by injecting air into the air chamber. (2) An outer film is wound around the outer peripheral film of the cylindrical cylindrical body, and the two are spaced at predetermined intervals in the circumferential direction. Forming a plurality of second air chambers partitioned between the outer film and the outer peripheral film by adhering to (3) A piercing tool is pierced from the outside of the outer film toward the air chamber And a step of perforating both the outer film and the outer peripheral film. (4) a step of closing a hole formed in the outer film.

  According to the manufacturing method of the present invention described above, after expanding the cylindrical body into a cylindrical shape (step (1)), the outer film is wound around the outer peripheral film of the cylindrical body, and the two are bonded at predetermined intervals in the circumferential direction. Thus, a plurality of second air chambers are formed (step (2)), and then both the outer membrane and the outer peripheral membrane are perforated with a punching tool from the outside of the outer membrane toward the air chamber (step (3). )), And finally, the holes of the outer film are closed (step (4)).

  In this case, since the outer film is wound around the outer peripheral film of the cylindrical body expanded into a cylindrical shape and bonded to each other at predetermined intervals in the circumferential direction, the circumferential position of the outer film with respect to the outer peripheral film Matching can be performed accurately and easily. For this reason, compared with the case where the outer membrane is attached to the outer peripheral membrane of the contracted cylindrical body (first method), it is possible to manufacture the pressure tube with a simpler bonding operation, which is close to a perfect circle when inflated. It is possible to reduce the labor for producing a pressure tube having a cross-sectional shape.

  When the outer film is first attached as described above, the communication hole cannot be formed only in the outer peripheral film. Therefore, in the manufacturing method of the present invention, both the outer membrane and the outer membrane are perforated, and the outer membrane pores (communication holes) are left by closing the outer membrane pores. A communication hole for communicating the air chamber is formed in the outer peripheral film.

  As described above, according to the present invention, in the pressurized tube that inflates the cylindrical body in the radially outward direction by injecting air, no recess is formed in the outer film when the cylindrical body is expanded. Can evenly press the inner peripheral surface of the existing pipeline, and further, the repair material to be attached to the outer coating can be evenly crimped to the inner peripheral surface of the existing pipeline.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a state where air is injected into a pressurizing tube according to the present embodiment and inflated, and FIG. 2 is a front sectional view of the pressurizing tube of FIG. 3 is a side sectional view of the pressure tube of FIG. 1, and FIG. 4 is a perspective view showing a state in which a repair material is mounted on the outer peripheral surface of the pressure tube of FIG.
As shown in FIGS. 1 to 4, the pressurizing tube 1 of the present embodiment includes a cylindrical body 2 made of an elastic body that expands radially outward by injecting air into the inside, and air to the cylindrical body 2. Air-injecting port 3 for injecting gas, a cylindrical outer film 4 made of an elastic body wound around the outer peripheral surface of the cylindrical body 2, and a tape-shaped outer skin made of an elastic body bonded to the outer peripheral surface of the outer film 4 Material 5 is provided.

The cylindrical body 2 has an outer peripheral film 2a and an inner peripheral film 2b, and an outer film 4 is wound around the outer peripheral film 2a.
Between the outer peripheral membrane 2a and the inner peripheral membrane 2b, annular spaces 2d and 2d are formed at both axial ends of the cylindrical body 2, and a plurality of suspension cloths are provided between the annular spaces 2d and 2d. 2c is attached to the outer peripheral film 2a and the inner peripheral film 2b at equal intervals in the circumferential direction. The suspension cloth 2c is circumferentially spaced between the outer peripheral film 2a and the inner peripheral film 2b and serves as a pressure wall, and a first air chamber 6 having a level difference in the circumferential direction is formed in the cylindrical body 2. The first air chamber 6 communicates with the annular spaces 2 d and 2 d at both axial ends of the cylindrical body 2.
The air inlet 3 is closed with a cap (not shown). When injecting or discharging air to the first air chamber 6, the cap is opened, and an air compressor (not shown) is connected to the air inlet 3, and the annular spaces 2 d and 2 d and the first air chamber 6 are connected. Air is injected or exhausted. Thereby, the cylindrical body 2 can be expanded or contracted in the radial direction.

The outer film 4 is wound around the outer peripheral film 2a between the annular spaces 2d and 2d, and from the one end in the axial direction of the outer film 4 for each circumferential center between the hanging cloths 2c adjacent in the circumferential direction. The other end is bonded to the apex portion 9 of the outer peripheral film 2a.
The outer coating 4 has annular side lid portions 4a and 4a made of an elastic body at both axial ends, and the side lid portions 4a and 4a are arranged along the circumferential direction of the outer circumferential membrane 2a in the annular spaces 2d and 2d. Are attached.
For this reason, both axial ends of the gap between the outer peripheral film 2a and the outer film 4 of the cylindrical body 2 are closed.

Thereby, a plurality of second air chambers 7 defined by the outer peripheral film 2a of the cylindrical body 2, the outer coating 4, and the side lid portions 4a and 4a are formed. In the second air chamber 7, the outer side in the radial direction is covered with the outer film 4, and the inner side in the radial direction is covered with the outer peripheral film 2 a. That is, the inner side in the radial direction of the second air chamber 7 faces the two first air chambers 6 adjacent in the circumferential direction. And the communication hole 7a which connects between either the 2nd air chamber 7 and the two 1st air chambers 6 facing this is shown in the enlarged view of FIG. It is formed on the outer peripheral film 2a.
In this case, as shown in the enlarged view of FIG. 2, the first air chamber 6 and the second air chamber 7 on the left side in the circumferential direction of the two adjacent first air chambers 6 communicate with each other. Thus, if air is injected or discharged from the air inlet 3 into the first air chamber 6, air can be injected or discharged into the second air chamber 7, so that the internal pressures of the first air chamber 6 and the second air chamber 7 are increased. Can be made equal.

The outer skin material 5 is wound around and adhered to the outer circumferential surface of the outer coating 4 in the circumferential direction in order to close the hole of the outer coating 4 formed by the manufacturing method described later. In addition, when the tubular body 2 is expanded in the radially outward direction, the outer skin material 5 applies pressure from the outside of the tubular body 2 and the outer coating 4 toward the radially inward direction. The strength of the body 2 and the outer coating 4 can be increased.
In the repair using the pressurizing tube 1, the synthetic resin repair material 8 is mounted on the outer peripheral surfaces of the outer skin 4 and the skin material 5 as shown in FIG. 4.
In this case, air is injected from the air inlet 3 into the first air chamber 6 and the second air chamber 7 to expand the cylindrical body 2, and the repair material 8 is installed on the outer peripheral surface of the outer skin 4 and the outer skin material 5. It can be pressed against the inner peripheral surface of the road. Thereby, the repair material 8 is pressure-bonded to the inner peripheral surface of the existing pipe line, and the inner peripheral surface of the existing pipe line can be repaired.

The cylindrical body 2, the outer coating 4, and the outer skin material 5 used here are made of a polymer elastic body or a reinforced polymer elastic body. As a raw material, for example, a material excellent in shape stability and shrinkage, such as natural rubber cloth, synthetic rubber cloth, embroidery cloth cloth, or reinforced rubber cloth cloth, can be used.
The cylindrical body 2 has, for example, an outer diameter of about 200 to 3000 mm and a total length of about 800 to 3000 mm. At this time, the radial width between the outer peripheral film 2a and the inner peripheral film 2b is about 50 to 500 mm. Become.
The pressurized tube 1 before air injection is in a contracted state and can be stored in a folded state. When repairing, the pressurized tube 1 in the contracted state is carried into the existing pipeline, and air is injected into the existing pipeline to inflate the pressurized tube 1. Further, after the repair, the pressure tube 1 can be discharged after the air in the existing tube is discharged and the pressure tube 1 is contracted, so that the pressure tube 1 can be easily carried into and out of the existing tube. It is excellent in safety because it does not require a rigid inner cylinder for shape stabilization.

Further, the repair material 8 is a synthetic material obtained by impregnating a reinforcing material such as glass fiber, carbon fiber or Kepler fiber with a resin binder of an engineer plastic resin such as an unsaturated polyester resin, an epoxy resin or an emulsion resin. It is a resin product. In particular, in repair in a water channel, the repair material 8 is impregnated with an underwater curable resin binder.
This repair material 8 can be combined with various raw materials according to the content of the repair, such as the size of cracks and holes in the inner peripheral surface of the existing pipeline to be repaired.

According to the pressurizing tube 1 of the present embodiment having the above-described configuration, a plurality of second air chambers 7 defined by the outer film 4 and the outer peripheral film 2a of the cylindrical body 2 are formed, and the second air chamber is formed. Since the communication hole 7a which connects between the first air chamber 6 and the first air chamber 6 facing this is formed, the internal pressures of the first air chamber 6 and the second air chamber 7 can be made equal. For this reason, when the cylindrical body 2 is expanded radially outward, the surface pressure can be made constant over the entire surface of the outer coating 4.
As a result, when air is injected to expand the cylindrical body 2 in the radially outward direction, the outer film 4 and the outer skin material 5 wound around the outer peripheral film 2a of the cylindrical body 2 do not have a recess, and the outer film 4 and the outer skin material 5 can uniformly press the inner peripheral surface of the existing pipe line, and the repair material 8 attached to the outer film 4 and the outer skin material 5 is evenly crimped to the inner peripheral surface of the existing pipe line. can do.

5 and 6 are process diagrams showing a procedure for manufacturing the outer coating 4 and the second air chamber 7.
With reference to FIGS. 5 and 6, a method for manufacturing the outer coating 4 and the second air chamber 7 of this embodiment will be described.
First, as shown to Fig.5 (a), air is inject | poured into the 1st air chamber 6, and the cylindrical body 2 is expanded to a cylindrical shape.
Next, as shown by an arrow A in FIG. 5B, the outer film 4 is wound around the outer peripheral film 2a of the cylindrical body 2 swelled in a cylindrical shape, and the outer peripheral film 2a and the outer film 4 of the cylindrical body 2 are wound. At a predetermined interval in the circumferential direction, in this case, on the circumferential apex portion 9 (see the enlarged view of FIG. 2) between the hanging cloths 2c adjacent in the circumferential direction of the outer peripheral film 2a of the cylindrical body 2 The film 4 is bonded from one end to the other end in the axial direction. In FIG.5 (b), this adhesion part is shown with the dashed-two dotted line.

And as shown in FIG.5 (c), the side cover parts 4a and 4a of the axial direction both ends of the outer membrane | film | coat 4 are adhere | attached along the circumferential direction on the outer peripheral surface of the outer peripheral film | membrane 2a of the cylindrical body 2, and several A second air chamber 7 is formed.
Next, as shown in FIG. 6A, a piercing tool indicated by an arrow B is pierced from the outer side of the outer coating 4 toward the first air chamber 6 to pierce both the outer coating 4 and the outer peripheral membrane 2a.
At this time, starting from the intersection of the extension line extending outward in the radial direction of each suspension cloth 2c, the line intersecting the outer peripheral film 2a, and the circumferential line at the substantially central portion in the axial direction of the outer peripheral film 2a, The outer peripheral membrane 2a and the first air chamber 6 are pierced with the punch shown by the arrow B toward the first left air chamber 6 in the circumferential direction of the two first air chambers 6 facing the chamber 7, A communication hole 7 a for communicating between the second air chamber 7 and the first air chamber 6 is formed.

Next, as shown in FIG. 6B, the punching tool indicated by the arrow B is pulled out. Thereafter, as shown by an arrow C in FIG. 6 (c), in order to close the hole formed in the outer skin 4 in the circumferential direction, the outer skin material 5 is wound once in the circumferential direction along the outer circumferential surface of the outer skin 4, Adhere.
In the actual manufacturing operation, the second air chamber 7 and the first air chamber 6 are in a deflated state by pulling out the punching tool indicated by the arrow B. For the sake of explanation, the second air chamber 7 and the first air chamber 6 are shown in FIGS. 6 (b) and 6 (c). The second air chamber 7 and the first air chamber 6 are left inflated.

In this way, a plurality of second air chambers 7 defined by the outer coating 4 and the outer peripheral film 2a of the cylindrical body 2 are formed, and the second air chamber 7 and one of the first air chambers facing the second air chamber 7 are formed. A communication hole 7a for communicating with the chamber 6 is formed.
Then, when air is again injected into the first air chamber 6 and the second air chamber 7 to expand the cylindrical body 2, the outer coating 4 and the outer skin material 5 have no recesses as shown in FIG. 6 (d). The inner peripheral surface of the existing pipe line can be evenly pressed by the outer peripheral surfaces of the outer coating 4 and the outer covering material 5.

  According to this manufacturing method, the outer film 4 is wound around the outer peripheral film 2a of the cylindrical body 2 expanded into a cylindrical shape, so that the outer peripheral film 2a and the outer film 4 of the cylindrical body 2 are predetermined in the circumferential direction. Since it is a process of bonding at intervals, it is possible to accurately and simply align the outer film 4 with respect to the outer peripheral film 2a of the cylindrical body 2 in the circumferential direction. For this reason, compared with the case where the outer membrane | film | coat 4 is mounted | worn with the outer peripheral film | membrane 2a of the shrinkable cylindrical body 2, the pressurization tube 1 can be manufactured by simpler adhesion | attachment work, It is possible to reduce the labor for producing the pressurized tube 1 having a cross-sectional shape close to a perfect circle at the time of expansion.

FIG. 7 shows a modification of the cylindrical body 2.
FIG. 7 is a side sectional view showing a modification of the cylindrical body 2.
In the cylindrical body 2 in this case, a plurality of conical hanging cloths 2c are attached at predetermined intervals in the axial direction between the outer peripheral film 2a and the inner peripheral film 2b. The suspension cloth 2c serves as a partition, and a first air chamber 6 having a step in the axial direction is formed. The first air chamber 6 has both ends in the axial direction communicating with the annular spaces 2d and 2d, so that the air in the annular spaces 2d and 2d can freely flow to the first air chamber 6. .

That is, the first air chamber 6 of the cylindrical body 2 shown in FIG. 3 is composed of one air chamber that is long in the axial direction, whereas the first air chamber 6 of the cylindrical body 2 shown in FIG. Has an air chamber having a level difference in the axial direction by pulling the outer peripheral film 2a and the inner peripheral film 2b by the suspension cloth 2c.
In addition, since the suspension cloth 2c has a communication hole (not shown), the air in the annular spaces 2d and 2d can flow through the first air chamber 6 in the axial direction.
In the case where the internal pressure is constant, the first air chamber 6 is configured such that if the suspension cloth 2c is increased, the steps arranged in the axial direction of the outer peripheral film 2a and the inner peripheral film 2b of the cylindrical body 2 are reduced. Strength is generated in the peripheral membrane 2b. For example, when the cylindrical body 2 becomes longer in the axial direction, the strength of the outer peripheral film 2a of the cylindrical body 2 is increased by forming a plurality of air chambers 6a in the axial direction as shown in FIG. Can be maintained.
The other points are not different from the cylindrical body 2 shown in FIG.

The present invention is not limited to the above embodiment.
For example, in the above embodiment, the skin material 5 is a tape-like member having a narrow axial width, but may be a member having the same axial width as the outer coating 4.
However, in this case, there is an advantage that the strength of the outer peripheral film 2a and the outer film 4 of the cylindrical body 2 can be further increased, but the work load for bonding increases as the bonding area increases. In other respects, the same effects as those of the above-described embodiment can be obtained. Thus, various aspects can be implemented without departing from the gist of the present invention.

It is a perspective view which shows the state which injected and inflated the pressure tube which concerns on one Embodiment of this invention. It is front sectional drawing of the pressurization tube of FIG. It is side surface sectional drawing of the pressurization tube of FIG. It is a perspective view which shows the state with which the repair material was mounted | worn with the outer peripheral surface of the pressurization tube of FIG. It is process drawing which shows the procedure which manufactures an outer membrane | film | coat. It is process drawing which shows the next procedure which manufactures an outer membrane | film | coat. It is side surface sectional drawing which shows the modification of a cylindrical body. It is a perspective view which shows the state by which the conventional pressurization tube was pressurized. It is a perspective view which shows the state by which the conventional pressurization tube was pressurized. It is explanatory drawing which shows the cross section of the hanging cloth attached to the conventional pressurization tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressurization tube 2 Cylindrical body 2a Outer peripheral membrane 2b Inner peripheral membrane 2c Hanging cloth 2d Annular space 3 Air injection port 4 Outer coating 4a Side lid part 5 Outer material 6 First air chamber 7 Second air chamber 7a Communication hole 8 Repair Material 9 Apex B B Drill

Claims (2)

A cylindrical body in which an air chamber arranged in the circumferential direction is formed between the outer peripheral membrane and the inner peripheral membrane, and an air inlet for injecting air into the air chamber of the cylindrical body. In a pressurized tube that injects air into the air chamber to expand the cylindrical body in the radially inner and outer directions,
A plurality of second air chambers defined by the outer film and the outer peripheral film are formed by winding an outer film around the outer peripheral film of the cylindrical body and adhering each apex of the outer peripheral film and the end of the outer peripheral film. A pressurizing tube, wherein a communication hole for injecting air is formed in the outer peripheral film between each second air chamber and the corresponding air chamber. A method of manufacturing a pressure tube including a cylindrical body in which air chambers arranged in a circumferential direction are formed between an outer peripheral membrane and an inner peripheral membrane, and includes the following steps (1) to (4) The manufacturing method of the pressurization tube characterized by these.
(1) A step of inflating the cylindrical body into a cylindrical shape by injecting air into the air chamber. (2) An outer film is wound around the outer peripheral film of the cylindrical cylindrical body, and the two are spaced at predetermined intervals in the circumferential direction. Forming a plurality of second air chambers partitioned between the outer film and the outer peripheral film by adhering to (3) A piercing tool is pierced from the outside of the outer film toward the air chamber And a step of perforating both the outer film and the outer peripheral film. (4) a step of closing a hole formed in the outer film.

Images